Is B34 a billable ICD-10-CM code?

No. B34 is a non-billable header code. Code to a higher level of specificity using one of its child codes.

Where does B34 sit in the tabular list?

Certain infectious and parasitic diseases (A00-B99), in the block Other viral diseases (B25-B34).

What cannot be coded together with B34?

B34 carries an Excludes1 note, which means the conditions it lists can never be coded together with it on the same encounter.

B34

B34 — Viral infection of unspecified site

Non-billable headerICD-10-CM

B34 is a non-billable header ICD-10-CM code for viral infection of unspecified site. It cannot be billed on its own: choose one of the more specific child codes below.

Excludes1 — never code together

These conditions cannot occur together. Billing both on the same encounter is a denial.

anogenital human papillomavirus infection (A63.0)
cytomegaloviral disease NOS (B25.9)
herpesvirus [herpes simplex] infection NOS (B00.9)
retrovirus infection NOS (B33.3)
viral agents as the cause of diseases classified elsewhere (B97.-)
viral warts due to human papillomavirus infection (B07)

Risk adjustment

B34 does not map to an HCC and does not risk-adjust under CMS-HCC V28. That is normal — most ICD-10 codes do not. It still needs to be coded correctly; it just will not move a RAF score.

Code to one of these instead B34

7 child codes. Green means billable.

Questions about B34

Is B34 a billable ICD-10-CM code?: No. B34 is a non-billable header code. Code to a higher level of specificity using one of its child codes.
Where does B34 sit in the tabular list?: Certain infectious and parasitic diseases (A00-B99), in the block Other viral diseases (B25-B34).
What cannot be coded together with B34?: B34 carries an Excludes1 note, which means the conditions it lists can never be coded together with it on the same encounter.